Question

Which of the following does not answer iodoform test?

• A. $n$-butyl alcohol
• B. $sec$-butyl alcohol
• C. acetophenone
• D. acetaldehyde
• E. ethyl methyl ketone

Answer 1

Answer: (A)

lodoform test is given by the compounds containing
$C{H}_{3}CO$ group or $C{H}_3\stackrel{|}{C}HOH$
group. $C{H}_{3}CHO+3I_2+3NaOH\to$ $\underset{\begin{array}{c}(yellowppt)\\ iodoform\end{array}}{CH{I}_3+}HCOONa+3NaI+3H_{2}O$
$\because$ n butyl alcohol $(C{H}_{3}C{H}_{2}C{H}_{2}C{H}_{2}OH)$ does not give iodoform test because it does not possess the $C{H}_{3}CO$ or $C{H}_3\stackrel{|}{C}HOH$ group.